what fish to add to my tank.

i currently have a 55 gallon that has been up for over a year and has 70lbs live rock and 90lbs live sand and i have a halloween crab, blue leg crab, normal red hermit crab, a crab that has little see through fans on its claws to filter feed(anyone know the name?), and a flame angel. I was wondering what other fish all of you would recommend. i only want one more so all suggestions welcome.
 
i am pretty much just looking for another colorful easy to care for fish. i was thinking of clowns but was wondering if there was something else out there i hadn't heard of.
 
Top